LCOV - code coverage report
Current view: top level - libavcodec - jpegtables.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 12 12 100.0 %
Date: 2017-12-12 11:08:38 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * MJPEG encoder and decoder
       3             :  * Copyright (c) 2000, 2001 Fabrice Bellard
       4             :  * Copyright (c) 2003 Alex Beregszaszi
       5             :  * Copyright (c) 2003-2004 Michael Niedermayer
       6             :  *
       7             :  * Support for external huffman table, various fixes (AVID workaround),
       8             :  * aspecting, new decode_frame mechanism and apple mjpeg-b support
       9             :  *                                  by Alex Beregszaszi
      10             :  *
      11             :  * This file is part of FFmpeg.
      12             :  *
      13             :  * FFmpeg is free software; you can redistribute it and/or
      14             :  * modify it under the terms of the GNU Lesser General Public
      15             :  * License as published by the Free Software Foundation; either
      16             :  * version 2.1 of the License, or (at your option) any later version.
      17             :  *
      18             :  * FFmpeg is distributed in the hope that it will be useful,
      19             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      20             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      21             :  * Lesser General Public License for more details.
      22             :  *
      23             :  * You should have received a copy of the GNU Lesser General Public
      24             :  * License along with FFmpeg; if not, write to the Free Software
      25             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      26             :  */
      27             : 
      28             : /**
      29             :  * @file
      30             :  * MJPEG encoder and decoder.
      31             :  */
      32             : 
      33             : #include "jpegtables.h"
      34             : 
      35             : 
      36             : #if 0
      37             : /* These are the sample quantization tables given in JPEG spec section K.1.
      38             :  * The spec says that the values given produce "good" quality, and
      39             :  * when divided by 2, "very good" quality.
      40             :  */
      41             : static const unsigned char std_luminance_quant_tbl[64] = {
      42             :     16,  11,  10,  16,  24,  40,  51,  61,
      43             :     12,  12,  14,  19,  26,  58,  60,  55,
      44             :     14,  13,  16,  24,  40,  57,  69,  56,
      45             :     14,  17,  22,  29,  51,  87,  80,  62,
      46             :     18,  22,  37,  56,  68, 109, 103,  77,
      47             :     24,  35,  55,  64,  81, 104, 113,  92,
      48             :     49,  64,  78,  87, 103, 121, 120, 101,
      49             :     72,  92,  95,  98, 112, 100, 103,  99
      50             : };
      51             : static const unsigned char std_chrominance_quant_tbl[64] = {
      52             :     17,  18,  24,  47,  99,  99,  99,  99,
      53             :     18,  21,  26,  66,  99,  99,  99,  99,
      54             :     24,  26,  56,  99,  99,  99,  99,  99,
      55             :     47,  66,  99,  99,  99,  99,  99,  99,
      56             :     99,  99,  99,  99,  99,  99,  99,  99,
      57             :     99,  99,  99,  99,  99,  99,  99,  99,
      58             :     99,  99,  99,  99,  99,  99,  99,  99,
      59             :     99,  99,  99,  99,  99,  99,  99,  99
      60             : };
      61             : #endif
      62             : 
      63             : /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
      64             : /* IMPORTANT: these are only valid for 8-bit data precision! */
      65             : const uint8_t avpriv_mjpeg_bits_dc_luminance[17] =
      66             : { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
      67             : const uint8_t avpriv_mjpeg_val_dc[12] =
      68             : { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
      69             : 
      70             : const uint8_t avpriv_mjpeg_bits_dc_chrominance[17] =
      71             : { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
      72             : 
      73             : const uint8_t avpriv_mjpeg_bits_ac_luminance[17] =
      74             : { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
      75             : const uint8_t avpriv_mjpeg_val_ac_luminance[] =
      76             : { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
      77             :   0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
      78             :   0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
      79             :   0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
      80             :   0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
      81             :   0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
      82             :   0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
      83             :   0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
      84             :   0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
      85             :   0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
      86             :   0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
      87             :   0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
      88             :   0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
      89             :   0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
      90             :   0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
      91             :   0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
      92             :   0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
      93             :   0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
      94             :   0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
      95             :   0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
      96             :   0xf9, 0xfa
      97             : };
      98             : 
      99             : const uint8_t avpriv_mjpeg_bits_ac_chrominance[17] =
     100             : { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
     101             : 
     102             : const uint8_t avpriv_mjpeg_val_ac_chrominance[] =
     103             : { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
     104             :   0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
     105             :   0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
     106             :   0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
     107             :   0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
     108             :   0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
     109             :   0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
     110             :   0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
     111             :   0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
     112             :   0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
     113             :   0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
     114             :   0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
     115             :   0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
     116             :   0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
     117             :   0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
     118             :   0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
     119             :   0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
     120             :   0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
     121             :   0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
     122             :   0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
     123             :   0xf9, 0xfa
     124             : };
     125             : 
     126             : /* isn't this function nicer than the one in the libjpeg ? */
     127       19519 : void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
     128             :                                   const uint8_t *bits_table,
     129             :                                   const uint8_t *val_table)
     130             : {
     131             :     int i, j, k,nb, code, sym;
     132             : 
     133       19519 :     code = 0;
     134       19519 :     k = 0;
     135      331823 :     for(i=1;i<=16;i++) {
     136      312304 :         nb = bits_table[i];
     137     1368987 :         for(j=0;j<nb;j++) {
     138     1056683 :             sym = val_table[k++];
     139     1056683 :             huff_size[sym] = i;
     140     1056683 :             huff_code[sym] = code;
     141     1056683 :             code++;
     142             :         }
     143      312304 :         code <<= 1;
     144             :     }
     145       19519 : }

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